This puzzle is difficult and I can not dissolved in the solution Vatni

On the night of cold winter people abroad want to enter the house, but doors and windows and all entrances are closed and tightly, divorced this person out of the window and clear the fog that it saw the owner slain
When you attend the police and interrogated accused of killing a house owner

Puzzle: see how the officer knew that this person is the killer ?????

This puzzle is difficult and I can not dissolved in the solution Vatni Icon_evil